I don't know what commercial Macsyma means by ev(...,diff), but Maxima's
documentation says:*
**Special symbol:* *diff*
When diff is present as an evflag in call to ev, all differentiations
indicated in expr are carried out.
For example,
(%i1) A: 'diff(Q,R)$ <<< an unevaluated differentiation
(%i2) Q: x^2$
(%i3) R: x$
(%i4) A;
(%o4) 'diff(Q,R,1)
(%i5) ev(A,diff); <<< substitute values (ev) and carry out
differentiations
(%o5) 2*x
(%i6) ev(A,nouns);
(%o6) 2*x
To differentiate something, just write diff( <expr> ) or diff(<expr>,<var>)
On Mon, Feb 7, 2011 at 13:58, Ron Wiltshire <rjwiltsh at gmail.com> wrote:
> Hello
>
> I am currently using wxMaxima 0.8.3a for Mac having used Macsyma for many
> years. I find that the function
>
> ev(sin(x),diff) does not return cos(x)
>
> although
>
> ev(2*(x+y),expand) will return 2x+2y.
>
> May be I am doing something wrong or perhaps there is a problem with
> ev(....., diff). Please can you advise?
>
>
>
> With kind regards - Ron Wiltshire
>
>
>
>
>
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